Chemical treatment of mechanical wood pulp

Details Chemical treatment of mechanical wood pulp Chemical treatment of mechanical wood pulp

D - Textiles, Paper

21

C

9/13

D21C 3/06 (2006.01)

Patent

CA 1177607

ABSTRACT OF THE DISCLOSURE A method of improving the strength properties of mechanical wood pulp is disclosed. The method reduces the shive content and makes the shive content in the reject fraction particularly susceptible to being broken up. In the method, the pulp is separated into a reject fraction and an accept fraction, the reject fraction containing a higher portion of shives and long fiber material, an aqueous solution of sodium sulfite is applied to the reject fraction, the solution having a pH in the range of about 2.5 to 13. The reject fraction is cooked at a temperature in the range of about 100 to 160°C for a period of time in the range of about 2 to 120 minutes such that after cooking the quantity of sulfonate bound to the reject fraction is in the range of about 0.6 to 1.6% based on the bone dry weight of the reject fraction, and the drainage time of the reject fraction is not reduced. The reject fraction is then refined and recombined with the accept fraction.

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